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Finding the Fourth Proportional to 811.50, 1,216.49 and 394.94

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Solution

The fourth proportional to 811.50, 1,216.49 and 394.94 is: 592.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.50 : 1,216.49 = 394.94 : x
  2. Step 2: Convert to fraction form
    811.50/1,216.49 = 394.94/x
  3. Step 3: Cross multiply
    811.50x = 1,216.49 × 394.94
  4. Step 4: Simplify right side
    811.50x = 480,440.56
  5. Step 5: Solve for x
    x = 480,440.56/811.50
  6. Step 6: Final answer
    x = 592.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.